Efeito da escovação com dentifrícios clareadores na rugosidade superficial do esmalte e da dentina
Effect of toothbrush with whitening dentifrices on surface roughness of enamel and dentin
Antonini, B.; Santos, C.B.; Veloso, K.P.M.; Marchi, G.M.; Rodrigues, J.A.; Amaral, C.M.
Rev. odontol. UNESP, vol.36, n2, p.121-126, 2007
Resumo
O objetivo deste estudo foi avaliar o efeito da escovação com dentifrícios clareadores compostos de diferentes abrasivos ou peróxidos na rugosidade superficial do esmalte e da dentina. Foram obtidos, de dentes bovinos, 65 fragmentos de esmalte e 65 de dentina com 4 x 4 mm, que foram incluídos em resina de poliestireno e polidos até a obtenção de superfície lisa e plana. A rugosidade inicial foi calculada através da média de três leituras realizadas em perfilômetro (Ra), com "cut off" de 0,25 mm e velocidade de 0,1 mm/s. Os corpos de prova foram escovados por 7500 ciclos com um dos dentifrícios (n = 13): Crest regular – controle, com sílica como abrasivo (C); Crest extra clareador com bicarbonato + pirofosfato de cálcio (CE); Dental Care com bicarbonato (DC); Rembrandt plus clareador com peróxido de carbamida + alumina e sílica (RP); Experimental com peróxido de hidrogênio + carbonato de cálcio (EX). Após a mensuração da rugosidade final, com os mesmos parâmetros, os dados foram submetidos à Análise de Variância e teste Tukey (α = 0,05). A escovação aumentou significativamente a rugosidade do esmalte e da dentina para todos os grupos, com exceção do dentifrício DC em dentina, que apresentou a menor rugosidade após escovação. Em esmalte, menores rugosidades foram observadas após escovação com os dentifrícios C, CE e EX.
Palavras-chave
Escovação, dentifrícios clareadores, rugosidade superficial, esmalte bovino, dentina bovina.
Abstract
The aim of this study was to evaluate the effect of toothbrush with whitening dentifrices with different abrasives and peroxides on the surface roughness of enamel and dentin. 65 fragments of enamel and dentin with 4 x 4 mm, were obtained from bovine incisors, they were included in polystyrene resin and polished. Initial surface roughness was calculated by mean of three measurements carried out by profilometer, with cut off of 0.25 mm and tracing speed of 0.1 mm/s. The samples were subjected to toothbrush using 7,500 strokes of brushing with one of dentifrices (n = 13): Crest Regular (C) – control, with silica; Crest Extra Whitening (CE) with sodium bicarbonate + calcium pyrophosphate; Dental Care (DC) with sodium bicarbonate; Rembrandt Plus (RP) with carbamida peroxide + alumina + silica; and Experimental dentifrice (EX) with hydrogen peroxide + calcium carbonate. Final surface roughness was measured with the same parameters. Data were submitted to ANOVA and Tukey’s test (p < 0.05). Toothbrush rosignificantly increased the surface roughness of enamel and dentin in all groups, except for DC dentifrice that presented the lowest roughness after toothbrush. For enamel, the lowest means of roughness after toothbrush were observed with C, CE and EX dentifrices.
Keywords
whitening dentifrices, surface roughness, bovine enamel, bovine dentin
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